Rock-reamer



(No Model.)

H. B. MORRISON. ROCK REAMER.

No. 444,008. Patented Jan. 6', 1891.

' of which the diameter of the bore may be en- 7 UNITED: STATES PATENT Diaries.

HORATIO B. MORRISON, OF BRITT, IOW'A.

ROCK-REAIVIER.

SPECIFICATION forming part of Letters Patent No. 444,008, dated January 6, 1891.

Application filed April 30, 1890.

To aZZ whom it may concern.-

Be it known that I, HORATIO B. MORRISON, a citizen of the United States. residing at Britt, in the county of Hancock and State of Iowa, have invented a new and useful Rock- Reainer, of which the following is a specification.

This invention relates to reaming-drills; and it has for its object to construct a drill of this class which shall be simple in construction and efficient in operation and by means larged, so as to admit of the passage of the well-casing.

My invention consists of the improved construction and arrangement of the parts of the said drill, which will be hereinafter fully described, and particularly pointed out in the claim.

Referring to the drawings hereto annexed, Figure 1 is a perspective view of my improved reaming-drill. Fig. 2 is a vertical sectional view of the same. Fig. 3 is a side viewshowing the drill with the reaming-bit extended in position for operation. Fig. 4: is a section taken on the line t 4 in Fig. 3.

Like numerals of reference indicate like parts in all the figures.

l designates the stock or body of my improved drill, the upper end of which is cylindrical in shape and the lower end of which is made slightly tapering, as shown at 2, to the point at which the bit 3 is formed. The out ting-edge of the bit is segmental in shape, as shown at 4:, and is slightly eccentric, so as to cause the drill to work slightly in excess to one side.

The body of the drill is provided with a slot 5, extending vertically through the greater portion of its length, and in the said slot is pivotally mounted a plate 7 the lower end of which forms the reaming-bit 8. Said bit is formed by flanges 9 on opposite sides of the plate 7, the lower edges of said flanges combining to form, in conjunction with the sharpened loweredge 10 of the blade 7, the cuttingedge of the bit. The plate 7, constituting the reaming-bit, is mountedpivotally upon a bolt or screw 11, which may be readily removed for the purpose of facilitating the removal of the bit when the latter is to be sharpened.

Serial No. 350,069. (No model.)

To keep the bolt or screw 11 from working out when the drill isin operation, I use a locking-washer 12 seated in a recess 12, bored for its reception in the side of the drillstock and having a tongue 12 which is bent over the head of the bolt. The latter has a nick or notch 12 to enable it to be adjusted or removed by means of an ordinary screw driver.

The plate 7 is provided some distance above its pivotal point and on the side opposite to that having the bit 8, with a projection 12, which, when the said bit is drawn back into the slot 3, is likewise confined within said slot, and which, when the reaming-bit is extended for operation, likewise projects a short distance beyond the said slot, as will be clearly seen in Fig. 3 of the drawings. The upper end of the plate 7 has a shoulder 13, which, when the reaming-bit is extended for operation, abuts against a plate 14 at the upper end of the slot 3, thus relieving the pivotal bolt 11 of excessive strain and wear, and the device is in operation.

Secured to the upper end of the slot 3 is a narrow leaf-spring 15, which is set edgewise and which serves to press against the plate 7, so as to normally throw the reaming-bit out of the slot 3 and into position for operation. The spring 15 is arrangedin the positionjust described, at the upper end of the slot, and is set edgewise, as described, in order to prevent it from being clogged and rendered inoperative by sand and bits of rock.

The upper end of the drill-body is screwthreaded, as shown at 16,to receive the coupling by means of which the drill is connected with the operating-rods, and the extreme up per end of said drill-body has a tapering interiorly-screw-threaded perforation or recess 17, which in the event of the coupling giving away or gripping may serve to receive a screw-threaded rod or implement by means .of which the drill may be fished out of the well. The drill-body is provided at its lower end directly above the point 3 with a groove or recess 18, which communicates with a channel 19, which opens into the lower end of the slot 3, and which serves to permit sand, dust, and water to escape.

The operation and advantages of my im- 2: d;&4,008

5 the hole which is drilled through rock for the purpose of admitting of the passage of the couplings of the well pipe or casing, the tool may be readily led down through the casing, the pressure of which against the projecting to portion 12 of the plate 7 serves to hold the reaming-bit in the slot 3 until the bottom of the casing is reached, when the pressure of the spring will at once throw the reaming-bit into position for operation. The drill may 15 then operate in the usual manner, after which, if desired, the drill may be withdrawn through the well-casing.

In drilling it oftentimes happens that where the drill strikes the rock the face of the rock 20 is not level and the coupling catches on one side and lets the quioksand pass into the pipe. In such case I cut out the hole three inches deep and drive the coupling into the enlarged hole, thereby shutting elf the sand.

Having thus described my invention, what I claim is- In a reaming-drill, the combination of the drill-body having the vertical slot 5, the bit 4:, the groove 18, and the transverse channel 19, connecting said groove with the slot 5, with the plate 7, pivoted in said slot and having the reaming-bit at its lower end, and the spring arranged at the upper end of said slot and bearing against the upper end of the plate 7, substantially as and for the purpose set forth.

In testimony that I claim the foregoing as my own I have hereto afiixed my signature in presence of two witnesses.

IT'ORATIO B. MORRISON.

\Yituesses:

,FRA'NKL. SCRIBNER, MARY A. MORRISON. 

